indeksoj
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angla x...
X-ray astronomy = iksradiastronomio
X-ray background = iksradia fono
x-ray binary = iksradia binaro
X-ray bright point = iksradia helpunkto
X-ray burst = iksradia eksplodo
X-rays = iksradioj
X-ray source = iksradia fonto
X-ray telescope = iksradia teleskopo